COPS hope the killer of Olivia Pratt-Korbel will turn supergrass to save his skin in prison.
Thomas Cashman has a £250,000 bounty on his head after he was jailed for life for the murder of the nine-year-old.
Police are due to quiz him within weeks over a string of murders, drug conspiracies and robberies across the North West.
A source said: “If he wants protection, he will need to talk.
“The strategy is to let him stew for a bit and maybe even let him see what prison life is like out of isolation.
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“Then cops will go in, question him and they will dangle the carrot of extra privileges if he talks.
“Officers think Cashman's testimony holds the to cleaning up the streets of Merseyside - he is that important.
“They know he realises he’s a dead man walking.
“His only chance of survival could be working with those who got him banged up.”
Cashman, 34, is in jail isolation.
He must serve a minimum of 42 years after shooting Olivia in Liverpool last August.
The two guns he used have not been recovered, sparking fears they will be used in other crimes.
